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ALL SPOILERS ARE UNMARKED. YOU HAVE BEEN WARNED.
Prologue
- Welcome to White Space. You have been living here for as long as you remember.
Omori is a clinically depressed and monochromatic child who has lived in a big, empty realm called White Space for as long as he can remember, with only his cat, Mewo, his tissues, and a computer for company. After finding his trusty knife, the white door in the realm then unlocks. Walking through it, he meets three of his purple-hued friends—Aubrey, Kel, and Hero—playing cards.
The four friends then go to the colorful outdoors and meet Mari, Omori’s older sister, and Basil at a playground there. They all look at photos taken by Basil inside of his photo album. After doing so and visiting Basil’s house, an unfamiliar photo falls out of the album. Once Basil picks it up, he becomes visibly distressed and panics for a moment, with a dark, ominous shadowy figure forming under him. Omori is then suddenly booted back to White Space. Omori stabs himself with his knife, and the previous events are revealed to be the dreams of a lone teenage shut-in named Sunny, who is moving out of town in three days.
Awoken in the middle of the night by his hunger, Sunny must face his crippling fear of heights to descend the stairs and eat some steak. After the food proves uneasy on Sunny’s stomach, and Sunny is later greeted by a hallucination of Mari at his front door, he goes back to sleep.
Once Omori wakes back up in White Space and returns to Headspace with his friends, Mari reveals that Basil has gone missing. Omori and his friends search the Vast Forest and later the outer-space Otherworld for him, learning of the space pirate Captain Spaceboy’s heartbreak-induced slumber after he and Sweetheart broke up. Once Captain Spaceboy awakens as the vengeful Space Ex-Boyfriend, the Headspace protagonists help him return to his former self. Omori then strays from his friends, led by a Basil-like shadowy figure called the Stranger into an odd barn, where Omori returns to White Space and stabs himself again.
Three Days Left
- Note: you can only access the main route by following Kel's request for Sunny to come outside.
Sunny wakes up the next morning and hears knocking on his door. Sunny opens the door to find an older, real-life version of Kel. The two venture outside and find out that Aubrey—now a rebellious, trouble-making delinquent who leads a gang called the Hooligans—stole Basil’s photo album. Kel picks a fight with Aubrey, but Aubrey and her newer friends scatter across Faraway Town once they find out that Sunny is in possession of his steak knife.
Sunny and Kel seek out the Hooligans in order to figure out Aubrey’s whereabouts and recover Basil’s photo album. They eventually find her in the town church. It’s then revealed that the real-life friend group broke apart over the suicide of Sunny’s older sister Mari. Kel tries apologizing for seemingly moving on too fast and denying Aubrey closure over Mari’s death, but Aubrey refuses to accept the apology. She initiates a fight with the two of them, much to the displeasure of the church. Humiliated by the remainder of the church, Aubrey flees to her house and throws away the photo album, which Sunny and Kel retrieve.
The two then proceed to visit Basil’s house for dinner, but Basil retreats to the bathroom upon learning that Sunny is about to move away, suffering from a panic attack and trying to pretend that everything will be okay. Unable to calm Basil down, Sunny returns home and goes upstairs. After facing his fear of spiders, he goes to bed for the night.
Omori goes to Headspace with his friends once again and trudges through the spider-infested Pyrefly Forest. Reaching the Sprout Mole Village and attending Sweetheart’s Quest for Hearts, the gang is locked into Sweetheart’s dungeon after Hero refuses Sweetheart’s attempt to marry him. Omori and friends eventually escape to Sweetheart’s castle and return to the stage to confront her. She is later wooed and married by Captain Spaceboy, blowing up her stage.
Omori leaps down the newfound hole and finds himself in a lost underground library, with books detailing Sunny’s lost childhood memories. He gets closer and closer to uncovering a dark truth that horridly traumatized Sunny and Basil.
Two Days Left
Sunny wakes up and returns outside with Kel, and the two are told by Basil’s caretaker, Polly, that Basil is missing. They find him threatened by all of the Hooligans in the friend group’s old secret hangout spot. After another confrontation, all of the Hooligans except Aubrey leave, and Aubrey accidentally shoves Basil into the lake in a fit of frustration. Sunny attempts to rescue Basil despite his fear of water and drowning, but both of them are saved by Kel’s older brother, Hero, who just returned from college. After Hero carries Basil back into his house, he, Kel, and Sunny hang out at Kel’s house for the rest of the day before going over to Sunny’s house one last time for a sleepover.
Omori goes to Headspace's playground, only to realize that everyone except him and Mari are missing. Mari, addressing Omori as her younger brother Sunny, guides him to the Deep Well. Omori finds Kel in front of the Last Resort casino, and it's revealed that everyone from the playground was tricked into signing contracts for Mr. Jawsum, forced to work for him for free for the rest of their lives. Omori and Kel recruit Aubrey and Hero, eventually freeing them from Mr. Jawsum.
The friends then traverse the Underwater Highway, and later enter the Deeper Well, whose denizens speak of the location’s properties and those of Headspace. Omori’s friends gradually forget about finding Basil, which was their main motivation for exploring Headspace. Entering Humphrey the Whale and exploring the Slime Girls’ lair and laboratories, they are forced to fight the Slime Girls and then Humphrey himself. After being expelled from Humphrey’s mouth, they return to Basil’s house, where there formed a chasm that leads to where Headspace!Basil is trapped. Omori leaps down, leaving the dreamy Headspace for the last time.
WELCOME TO BLACK SPACE
Omori finds himself in a dark offshot of his familiar haven, littered with Strangers walking around afar, and numerous doors leading to strange and nightmarish areas. Some of these contain the Stranger, who commends Sunny's desire to seek the truth that was lost. Certain others have Headspace!Basil seemingly being rescued, only to gruesomely die before Omori can return to the hub. A door with a red glow within is eventually revealed. Omori enters a strange church where Basil is being held captive again. Basil is pulled into something strange, and Omori follows him into Red Space. Omori betrays and kills Basil one last time, and he walks over Basil's stabbed corpse and sits on his throne of hands, communicating that he has total control over Black and White Space and will punish Sunny for his insolence.
One Day Left
Sunny, Kel, and Hero find Aubrey's house with her withdrawn inside and her fellow Hooligans worried outside. They go to her room and find photos with Mari in them that Basil allegedly scribbled out. The friends reconcile with one another, and then go to Sunny's backyard and treehouse to reminisce about the childhood they lost. After putting every single photo back in its place, the friends have one last sleepover at Basil's house in the hopes of comforting him before his best friend Sunny leaves, even though Basil refuses to leave his room.
Upon going to sleep, Sunny winds up in White Space with Omori, and destroys the darkness-emitting lightbulb that represents the repression of the truth. Sunny then confronts the "Something" that traumatized him over the last few years. He faces his past fears once more before discovering Something's true shape: Mari's hanged corpse. Soon, Sunny fully realizes the secret that he repressed: Mari didn't actually commit suicide. During a heated argument over their upcoming musical recital, Sunny accidentally killed his sister by pushing her down the staircase. Then Basil, who happened to arrive in time to witness this, convinced him to stage it as a suicide to prevent anyone else from finding out the truth. The guilt and suicidal ideation they shared resulted in Basil becoming more anxious and timid than ever before, and is why Sunny locked inself up in his home — and Headspace — for so long.
Sunny is jolted awake in the middle of the night by this realization, with Basil in an extremely unstable state. If Sunny goes back to sleep, Basil succumbs to his despair and kills himself, devastating all of his friends. Should Sunny save him, however, Basil remains in denial that his friend Sunny could have ever killed Mari. Presumably due to both Basil being deathly afraid of Sunny leaving him and Basil trying to destroy the "Something" that traumatized them both, the two boys wind up in a brutal fight that ends with Basil cutting into Sunny's eye with his garden shears, before they both black out and are rushed to a hospital.
Sunny then remembers the good times he spent with his friends, slowly growing to accept his trauma and vowing to rebuild his friend group before he moves. He imagines his friends encouraging him, and cherishes those moments. He returns to White Space to battle his dream world alter-ego, Omori, with the stakes being Sunny's own mind.
Throughout the fight, Omori berates Sunny for what he caused and tries to convince him that his friends wouldn't love his true self and that he deserves to die. Although Sunny has stopped running from his problems, it is impossible for him to barrel through them either, and Sunny inevitably falls to Omori. The game then asks if you, the player, want to continue — a choice much, much more important than the "Do you want to retry?" prompt for fights you were supposed to win.
If you select "NO", Omori succeeds in taking over Sunny's mind and body, and after Headspace is reset, "Sunny" kills himself by jumping off the hospital balcony, leading to the bad ending of the game.
If you select "YES", however, Sunny gets back up, draws his violin, and plays the duet with Mari that he never got the chance to play. Omori fades from Sunny's mind due to Sunny moving on with his life. Sunny wakes up in the hospital, and tears flow from his good eye. He then goes to Basil's hospital room and tells his friends about what really happened to Mari, leading to the good ending of the game.
If you reached the good ending and have watered Headspace!Basil's flowers before defeating Humphrey, a special cutscene plays where Sunny and Basil smile at one another as their respective Somethings disappear.
Hikikomori Route
- Note: you can only access this route by choosing to stay inside when Kel asks Sunny to come outside.
Sunny chooses not to go outside when Kel knocks on his door, and instead goes about the day cleaning the house instead. While nothing changes in Headspace at first, when it comes time to enter Black Space, Sunny, who has failed to even try and face the truth, is attacked by the Stranger in an effort to remember. Instead, Sunny breaks down, and when Omori saves him from the Stranger, Omori takes over completely, with the Stranger giving up. Omori then frees Basil from Something and then walks out of Black Space with Basil in tow, soon going to sleep in the Neighbor's Bedroom and resetting Headspace.
You are rewarded by being able to travel across a new Headspace. In this one, Basil never leaves Mari's picnic blanket and as such, never learns the truth and disappears. There are also new areas of interest, such as Snowglobe Mountain, a snowy mountain where Space Ex-Husband has moved to after his divorce with Sweetheart, and The Abyss, a shadowy realm that houses many dark secrets about the secrets of Headspace.
After completing everything the new Headspace has to offer, Omori wakes up and is then given a choice to either use the knife to return to Headspace (which kills him instead) or finish packing Sunny's things and depart from Faraway Town with his mother, while sirens blare in the background, heavily implying that Basil has died by suicide.
